WebM

The WebM Project is dedicated to developing a high-quality, open video format for the Web that's freely available to everyone.

WebM is an audio-video container format designed to provide royalty-free, open video compression for use with HTML5 video. The WebM Project releases WebM-related software under a BSD license and all users are granted a worldwide, non-exclusive, no-charge, royalty-free patent license. The project is sponsored by Google.